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UNITED STATES PATENT onrucn FABRICIUS COBELLIS, OF PHILADELPHIA, PENNSYLVANIA.

' MIANUFACTURE OF PEROXID OF HYDROGEN.

No Drawing.

To all whom it may concern:

Be it known that I, FABRIC-HIS CoBELLis, a subject of the King of Italy, residing at No.1 1523 Green street, in the city of Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented certain new and useful Improvements in the Manufacture of Peroxid of Hydrogen, of which the following is a specification.

According. to my process I produce persulfate of ammonium by the electrolysis, at a low temperature, of a solution of ammonium bi-sulfate. To the per-sulfate thus produced additional bi-sulfate is added and the solution heated under pressure whereby the per-sulfate is split up with formation of hydrogen peroxid, which is distilled off by the application of a vacuum. The remaining bi-sulfate may be used over again.

As an example of the practice of my process, I willinstance the following: Take a solution of ammonium sulfate of about three pounds to the gallon, and add thereto say three pounds of sulfuric acid, producing an acid solution which I will term a bi-sulfate. This solution is placed in a cell with suitable electrodes. I have found it desirable to employ a platinum anode and a lead cathode. During the electrolysis it is important to keep the electrolyte at a temperature below sixty degrees F. I find that the process proceeds best at a temperature of about fortyfive degrees F. Further lowering the temperature increases the resistance of the electrolyte apparently without any corresponding advanta e. At a temperature over sixty degrees oxygen is lost. The cooling of the cell with its electrolyte may be accomplished in any convenient manner, as for instance, by immersion of the cell in a solution of cold brine. As the electrolysis proceeds the ammonium sulfate is converted into per-sulfate. WVhen this has been sufficiently accomplished the solution is drawn off and placed in an autoclave with the addition of am monium bi-sulfate, say about six pounds to the gallon. In the autoclave the solution is subjected to a pressure of about one hundred pounds and under this pressure is heated to about 280 F., at which temper..- ture the per-sulfate is split up with production of hydrogen peroxid combined with solution of ammonium sulfate. This mixture is then cooled down to about 150 F., the pressure released and in place thereof a vacuum applied, whereupon hydrogen per- Specification of Letters Patent.

monium sulfate, and

oxiol distils over and may be collected by means of a suitable still. In order to secure complete and rapid distillation I find it desirable to pass dry air or other inert gas through the solution, under the reduced pressure produced by the vacuum.

It will be understood that the proportions which I have mentioned may be considerably varied. I believe that the required ammonium bi-sulfate is best produced by the ment of ammonium per-sulfate otherwise produced.

Although I have described the removal of the hydrogen peroxid by distillation in cacao, there are other known Ways of recovering the hydrogen peroxid from the sulfate solution.

Having thus described my invention, I claim:

1. The process of manufacturing peroxid of hydrogen, which consists in combining in solution ammonium per-sulfate and ammonium lei-sulfate, heating the solution under pressure, whereby the per-sulfate is split up with formation of peroxid of hydrogen, and subsequently removing the peroxid of hydrogen from the solution.

2. The process of manufacturing peroxid of hydrogen, which consists in adding ammonium bi-sulfate to a solution of ammonium per-sulfate, heating the same under pressure and subsequently distilling off the peroxid of hydrogen in oacuo.

3. The process of manufacturing peroxid of hydrogen, which consists of converting ammonium sulfate into ammonium per-sulfate by electrolysis, heating the solution thus produced under pressure, whereby it is converted into peroxid of hydrogen, and amdistilling over the peroxid of hydrogen.

at. The continuous process of manufacturing peroxid of hydrogen, which consists in Patented Aug. 22, 1916.

Application filed August 23, 1915. Serial No. 46,808.

tilling off the peroxid of hydrogen in'oacuo; and again electrolyizin-g the sulfate solutionas the first step in a repetition of the process.

electrolyzing at a comparatively low temperature, a solution of ammonium sulfate,

with formation of ammonium'per-sulfate; raising the temperature under pressure,

u' herebyithe per-sulfate is again converted into sulfate, and p'eroxid of hydrogen; dis- 5. The process of manufacturing peroxid of hydrogen, which consists; in combining Copies ot'this patent may be obtained for of hydrogen 'vaowo, accompanied by the injection of an inert gas intqthe solution.

6. The process of manufacturing peroxid of hydrogen, which consistsin subjecting a solution of a per-sulfate salt to heat under pressure, whereby itis conxierted into peroxid f hydrogen and the cort 'esponding sulfate salt in solution, and distilling over the peroxid of hydrogen. V

In testimony whereof, Ljnave hereunto signed my name at Philadel. hia, Pennsyl- Vania, this twenty-first day 0] August, 1915.-

FABRIGIUS QOBELLIS. Witnesses: i

JAMES BELL,

L. FULLERTOI five cents each, by addressingvthe Commissioner of Patents, Washington, D. C." 

